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I have used several different thermostatic switches, usually non-adjustable for ease of install, and this is the first one that has proven reliable. Being adjustable, this one is slightly more complex to install, but it's well worth it.

Just a tip: To make your install that much safer, use the switch to toggle your relay's GROUND, rather than positive pole. That means of the 2 connections to the switch, one is simply a very short wire to your mounting point, and the other simply hooks to the relay ground. Easy and reliable. Anytime you can take the positive connection out of a switch, it just makes it that much safer/durable.

The only thing I don't like is that the "knob" to adjust the switch has no true "knob". I found that the volume knob off an old CB worked, but it really should come with the switch, as not everyone has junk automotive electronics laying around to scavenge from.

For the most accurate reading of temps in the engine, and therefore most consistent operation, install the probe on the radiator in a spot nearest to the INLET. The inlet is the hottest part of the radiator, and accurately represents the temperature of the water in the engine. The further from the inlet, the cooler the water will get as the radiator does it's job and radiates heat from the water.

If you cannot put the probe anywhere near the inlet, don't worry, because you control the operational setting, and can adjust for this. It just won't be as consistent as it could be by operating at the hottest location.

Don't turn the unit on before your thermostat opens, as that is just wasted effort, which equals reduced power and economy. The engine won't cool until the water is actually flowing, after the thermostat opens.

This unit can be wired to control a fan and/or an electric water pump. Using your imagination, could control other electric devices as well.

I HAD BOUGHT THIS BECAUSE OF THE POSITIVE REVIEWS. AND THE PRICE WAS GREAT TOO! NOW WHEN I PICKED IT UP, IT LOOKED TOO SIMPLE TO WORK SO I DECIDED ON A MORE EXPENSIVE AND COMPLICATED UNIT...IT DID'NT WORK WELL AND IT BURNT OUT.(I DO HAVE A REVIEW THAT I LEFT FOR THAT).SO I WENT BACK AND GOT THIS UNIT AND IT WAS FLAWLESS AND WORKS GREAT.

Priced the very same product on [...], [...] and a half dozen others. Advance beat the price by a pleasant margin. Unit is simple, complete with everything you need to swap in an electric fan or customize you're fan temp on/off settings Unit is complete with adjustable sensor, probe, and relay and understandable instructions. You just can't ask for much more.

This item has the same picture as the "Hayden Automotive 3653 Economy Adjustable Thermostatic Fan Control" sold somewhere else. That unit, which again looks identical, states that the temp range is - 160 to 210 degrees Fahrenheit.On your website, it states 32-248°F. This is for a HEAT EXCHANGER core for air to water, so I need to be able to adjust temps lower than coolant temps. Please advise.

I'm glad to assist, John! This Imperial adjustable thermostatic fan control may be able to control two small fans. It has a 16 amp load capacity. For higher capacity loads try Imperial Part No. 226204. It can handle a 30 amp load and is pre-wired for two single speed fans. It also includes an A/C override.

A 14 gauge wire would most likely handle the 16 amp load. For the 30 amp load a 12 gauge wire would be a good choice.

Answered on 6/18/2014 by Heath, ASE Parts Specialist from AAP

Q:

Can I get the wiring diagram for 226203 for my ford truck? The package did not have any directions.

Hi William, I understand your concern with the misinformation provided to you online. The load capacity of this thermostatic fan control is 16 AMPS. I will forward this to the appropriate department and have this updated on our website at the earliest.

Answered on 1/29/2014 by Vincent from AAP

Q:

I have a 1990 ford f350 4x4 351w mud truck im going to put an electric fan where should i put the control unit inside the cab or on the radiator core support

Hi Joey, great question! This adjustable thermostatic fan control is an exact fit for your 1990 Ford F-350 Pickup. The installation instruction for this fan control has been sent to the email address provided for your kind reference.

This Imperial Adjustable Thermostatic Fan Control - part# 226203 is a temperature controlled relay. When the temperature reaches the set point the relay activates and 12V turns on the fan. So both of the connections on the unit receive 12V, one from the ignition and the other goes to the positive fan wire and is activated when it reaches the desired temperature. For any further assistance, you may also call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

Answered on 9/10/2013 by Vincent from AAP

Q:

i have 1956 chevy with 350 and electric fan & thermo of 190.what temp should the fan be set.

The Imperial Adjustable Thermostatic Fan Control (Part No. 226203) use 32 degrees - 248 degrees for install into radiator fins. For any further assistance, please feel free to call us at 1-877-238-2623 or visit your nearest Advance Auto Parts store and one of our representatives would be more than happy to assist you.

Answered on 6/6/2013 by Max from AAP

Q:

Is the controller waterproof or water resistant? If not, I suppose the controller should be mounted within the passenger compartment of a vehicle, am I correct in my supposition?

No, I am sorry. The Imperial Adjustable Thermostatic Fan Control - Part No. 226203 is not a waterproof part. For further assistance regarding the installation of this part, please provide the year, make, model and engine size of the vehicle in question. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

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